Or stopping the action of machinery



(N0.M-ode1.) I 2 Sheets-:heet l.

v J. D. WRIGHT. MEUHANISM FOR CHECKING 0R STOPPING THE ACTION OFMACHINERY;

No. 297,330. Pafaelilted Apr. 22,1884.

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(No Model.) 2 Sheets-Sheet 2.

J. D. WRIGHT.

MECHANISM FOR CHECKING 0R STOPPING THE ACTION OF MACHINERY.

No. 297,830. Patented Apr. 22, 1884.

in TATES JACOB D. WRIGHT, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO THEWRIGHT MACHINE COMPANY, OF SAME PLACE.

MECHANISM FOR CHECKING OR STOPPING THE ACTION OF MACHINERY.

SPECIFICATION forming part of Letters Patent No. 297,330, dated April22, 188%.

Application filed December 5, 1883.

To all whom it may concern.-

Be it known that I, JACOB D. TVRIGHT, a citizen of the United States,residing at Worcester, in the county of \Vorcester and State ofMassachusetts, have invented certain new and useful Improvements inMechanical Movements; and l declare the following to be a description ofmy said invention sufficiently full, clear, and exact to enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, which form a part ofthis specification.

The object of my invention is to provide a simple, practical, andefficient mechanism for checking or stopping the action of machinerywhen the driving belt or motor is shipped off, reversed, ordisconnected; also, for retaining the operated mechanism at any positionof its action where desired when the operating forces have ceased to actfor moving the machinery. I attain these objects by mechanism thenature, construction, and operation of which is illustrated in thedrawings and explained in the following description, the particularsubjectmatterclaimed being herein-alter definitely specified. Thismechanical movement is adapted for use in hoisting machinery and the machinery of elevators, and is herein shown and described as applied to amachine of that class. 1 do not, however, desire to confine theemployment of my invention to any particular class of machinery orpurpose of use, as it may be employed with advantage in differentsituations and in various classes of machinery.

In the drawings, Figure 1 is a front view of my improved mechanicalmovement. Fig. 2 is a section of the same at line at m. Fig. 3 is a viewof one of the slide-pieces separate from the other parts. Fig. 4 is aperspective View of the operating-hub. Fig. 5 is a side view of themechanism without the rim or flange plate. Fig. 6 is a cross-section ofone of the arms at line 3 3 and Fig. 7 is a plan view, showing mymechanical movement applied for use in hoisting apparatus or elevatormachinery. Fig. 8 illustrates a modification in construction, whereinthe rim or flange is made revoluble and the arm or disk fixed inposition. Fig. 9 is a vertical section of the same.

(No model.)

In the drawings, A denotes the supportingframe, which may be of anysuitable construction for supporting the operating parts.

B indicates a revoluble shaft mounted in suitable bearings on the frame,and provided with a tight pulley, C, and two loose pulleys, C and C, fordriving belts to turn the shaft B to the right or left, respectively,according as one or the other of the belts is shifted onto the pulley C.

D indicates a rim, plate, or flange rigidly connected to the frame A,and having a suitable surface for receiving the grip of frictionpads orclutchjaws.

E is a disk, cross-head, or arm rigidly fixed upon one end of a sleeve,E, mounted loose upon the shaft B, and supported to turn in the bearinga of the frame A. Said sleeve E has rigidly fixed to its opposite endthe driving pinion or wheel F, by which movementis transmitted to thegear G on the winding-drum shaft H, or to such other machinery as it isdesired to operate.

1 I indicate jaws or slide-pieces, which are mounted on the disk orcross-head E and arranged in suitable guideways for radial reciprocativeaction. I Said slides are provided at their outer ends with frictionpadst, that match and embrace the friction surface of the rim or plate D,and in connection therewith form a clutch for retaining the head E atany position of the oi role. Springs J are arranged in connection withthe slides l and head E, for forcing the pads t against the fiangeD withthe desired degree of pressure.

K indicates a rectangular hub or block rigidly secured to the shaft Band located between the inner ends of the radial slide-pieces I, whichare made of proper shape to receive the action of the hub K, ashereinafter explained.

The hub K is furnished with a radial projection or arm, on, that engageswith lugs e 0, formed upon the disk E, and by means of which said diskor cross-head E is revolved when motion is imparted to the shaft B. Asuitable amount of space or lateral play is allowed between theprojection m and lugs e to permit of the shaft 13 and hub K moving, fora limited distance before the projection m engages thelug e, suchmovementbeingsufficient I to change the position of the square part ofthe hub to a diagonal direction in relation to the inner ends of theslides 1', and thus, by bringing the projecting angles 1 of the hub K tobear against said inner ends, to overcome the force ofthe springs J, soas to effecta radial movement of slides, causing the friction-pads z' tobe raised or disengaged from the surface of the stationary rim D,leaving the head E free to revolve when the projection m strikes the log0. The contact 01 the projection m is with one of the lugs a when theshaft Bis turned to the right and with the other lug 0 when the shaft isturned to the left.

Any equivalent engaging devices may be employed in lieu oflugs in and c,if preferred.

111 the operation of the mechanism, the shaft 13 being revolved by thedriving belt on the pulley O, the pressure of the projection 111.against the lug c carries around the head E and driving-pinion F,thereby operating the gear G and winding-drum H or other machinery thatmay be connected with said head E or its gear F. when the driving poweror force exerted for revolving shaft 13 ceases to act, by reason of theshifting of the belt from the pulley O, or from any cause, accidental orotherwise, the springs J, being no longer resistedor overcome by thecounter action of said driving force, immediately act to return thepartsto normal position, bringing the friction'pads i again into contactwith the stationary rim D, and these pads, by their clutch upon the rim.check the revolution ofthe head E and pinion F, and retain the operatedmechanism at a fixed position until rotary action is again imparted tothe shaft B and hub K. The action is substantially the same whether theshaft B is revolved to the right or to the left.

The pads dare herein shown as taking hearing upon the exterior surfaceof the rim D; but said pads could be arranged to bear upon said rim inother position, as the side face or inner surface, if desired, theirmovement and action being eit'ected in equivalent manner to thatdescribed above.

It will be understood that the mechanism shown and herein described canbe combined with any class of machinery for which it is adapted totransmit or arrest motion, and that instead of using the pinion F theconnection with such machinery can be made in any convenient manner,according to the requirements in each particular case.

In lieu of making the hub K rectangular in form, it may be made of anyother suitable shape, whereby the slides or jaws I will be operated forrelieving the clutch, in the manner hercinbefore set forth.

As a modification in theconstruction of the mechanism, in lieu of makingthe part D stationary and theparts E revoluble, the reverse order may beavailed of,and the flange or rim may be the revoluble part, and thecross-bar,

disk, or part E may be fixed stationary, the hub K being operatedindependently of the flange, as illustrated in Fi 8.

What I claim as of my invention, and desire to secure by Letters Patent,is

1. The revoluble head or disk E, provided with lugs e, and carryingradially-moving frict-ioirpad slides I, with recoil-springs J, incombination with a stationary concentric fric tion-fiange, D, and acentrally-located operating-hub, K, having a projection, m, for engagingsaid disk, and provided with angles Z, for moving said slides when thehub isturncd to the position of engagement with said disk, substantiallyas set forth.

2. The combination. substantially as hereinbefore described, of theshaft B, having the hub K fixed thereon. the head or disk in, mountedloose on said shaft, and carrying the drivingpinion F, theradiallymoving slides l, carrying frictioirpads 'i, the springs J, thestationary frictioirrim D, and means for effecting engagementbetweensaid hu b and disk, and for moving said slides by action of the hub, asset forth.

3. The combination of the following elements, viz: a central shaft,stud, or axis, a frictional surface concentric therewith, frictionalpads for engaging said surface mounted on guiding-slides, in connectionwith a support plate or disk concentric with or centered upon said axis,and provided with springs for forcing thepads againstsaid frictionalsurface, and a central hub or device adapted for counteracting saidsprings and relieving the frictional contact when the motive force isapplied for starting and operating the machinery.

4. A head or disk carrying slides or friction-pads operated by springs,and a friction flange or plate, either of which may be stationary andthe other rcvoluhle, in combination with a suitable device for operatingthe friction-pads against the action of the springs when the motivepower is brought into action, substantially as set forth.

5. The friction-slides, with their pads and springs, and thefriction-flange, in combination with means for automatically relievingthe friction and permitting the operation of the mechanism when power isapplied to the revoluble shaft by the action of the propelling forceexerted through said shaft.

Witness my hand this 21st day of Novena her, A. D. 1883.

JACOB D. WVRIGHT.

"Witnesses:

Ci-ms. I-I. BURLEIGH, J. WALTER SMITH.

